This edited volume brings together leading authors and actors in EU internal market law and policy, revisiting the classic themes in a contemporary context and considering (re-)directions for the future. The EU would not be where and what it is today without its internal market. It is the cradle of the EU’s most important legal doctrines and the source of the most significant amount of European integration. And, as Brexit has underlined, it remains the primary political reason for EU membership. Considering the well-established and fundamental nature of internal market law, it is striking to find many crucial doctrinal questions still unanswered today, as explored by this book. Furthermore, these questions now find a new legal, social and political context: one that is acutely aware of the contested nature of the EU and its policies and the need to embed the internal market project in a broader setting of constitutional norms and values. This need is made all the more pressing by the rapidly changing and often disruptive technological context. The various contributions to this book contribute to finding a new direction for continued European integration in changing times, by rethinking, and where necessary reinventing, the role and purpose of this area that remains the EU’s beating heart.